At present, the application of sensing smart homes in human life is already very common. Is the scene of "people coming with lights on, people walking with lights off" very familiar? It can be said that it is an intelligent way that can be seen everywhere in daily life.
Have you ever wondered how this was achieved?
The secret behind induction satisfies all your curiosity!
It's not complicated to say, but in fact, using human sensors can easily achieve it. The function of a human body sensor is to complete specific intelligent commands by sensing the movement of a human body or pet.
It is worth noting that its working principle is to sense the movement of the human body and pets, that is, to recognize the changes in infrared radiation emitted by the human body and pets. If the human body and pets are in a stationary state, the human body sensor cannot distinguish whether there are people and pets present.
In terms of the current smart market, the vast majority of human sensors adopt the principle of the "pyroelectric effect".
Simply put, it is because the human or animal body radiates infrared rays related to its own temperature. When the emitted infrared rays are irradiated on the pyroelectric material, the material will generate a signal of potential changes. Based on this signal, it can be determined whether a person or pet has moved.
Due to the extremely weak infrared signal emitted by the human body, a "Fresnel lens" is usually added to the design of human sensors at the beginning, in order to increase the detection distance of human infrared and achieve higher accuracy in human movement detection.